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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f940790dbbca599b699a4bee9fe9749b76e8e316785cbbcb4c3fd4daf05f9d87' 
  AND token = '1mFO2uAuFABMhAXjp1BT7VYK1L8SMVYdg4x8njYkXCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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