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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2046b24df68bf259d84d9c28936dc59be5be6a67c5bd41b5621157e019aff2' 
  AND token = 'tM8PMALcRhXody4bwjA6ZpkmuoqgEiyWTJZOY+hOTu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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