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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4430b887f926ca0f599b32b49979cb68b592bb93488f40e9cf3e3c54e2989a59' 
  AND token = '7gkDjKAX9OtgQJjoYf92sDU+KEutJ3Zi55tCjk+0ym0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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