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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcc6c9c2b7f1d640845f5c482bbc6a324faec8b9d325dab3f1e92daa30c9ffc' 
  AND token = 'zobo3LrSwEeAssVr33W5elH8mx/L5DGHDp6xXkWCQuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}