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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd369e452ee3aae2488829411e35d0e6d99d931fb0404aa92a23582f8aba68c' 
  AND token = '5dFR/MPMYr4lLEkakQgIUx7fnNy8UuhcsA2M7g5V5IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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