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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733e66f3ef109642c0ae9c6f9e4d4eafd61f2a692ceb707c2a51ecc7fa2345eb' 
  AND token = 'HnjmsVyqcEO82TQ0rXtFmzDX2s+dOXjXWn9+Op0vt9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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