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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd5515a72aece407251c5efe1df83f47493cd7841b7ca6af0052e194e59ccbb' 
  AND token = 'PNQ1cS7mz8a+yGOEKPqEVNqT3S6Hd1KS46VqX5PJ7jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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