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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4831c6729e980eda2d8a7de3fe18a6b64d1d5b3fdda4976e9d1479c01ec4d7a2' 
  AND token = 'evQ4LKXdF0029XezZ2XruCMxhqarih6oYexiUt7VoXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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