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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb906444a74bda716e5ac86b1040461f8dacb06a84adf94d436e67c047a510bb' 
  AND token = '8AwBro5MJi23wTAyDV4mKRGXFbNtwoexdAR5+hOXKyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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