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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270246526cdbb181f06c1f31ac16429b4ed50484d4b140d9f714eb1708116ff6' 
  AND token = 'jh4GOZhhgXkzavZxXKC4l6h2KhBMlFzb/0noYQ1fx2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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