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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fb3e2410e4d486a40f9a30251c23dc502c5da6eb73e83733c0056c3f6d426f' 
  AND token = '620UqOVTuHoSzgafBurCqeVQNjPeseV1K8UVEf6Twgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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