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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236b27740f8b3555ee62e7acb05404bb4326739798b7f5b19ef06419f0c84c77' 
  AND token = 'e53l6kvk9aMz3Kt3jn7apPLGBVuKuSZAYis71bRKwIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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