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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d33eaeed9df77df3c05bd658e5b1254143fae04e4f8bf590983b25995551f24' 
  AND token = 'hKktSVJVbd+RuhHHYKqkBQ5tCxqwHSVDQrKRPLS86SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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