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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0063ccd490085145b7e8eb6a4f763b96ef216985e297715bb488cc6ed8f33656' 
  AND token = '7HZZf9uiy94nXxqIWqrp3NZSR6X55oF6A0rXDsjk6oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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