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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e56cdf35ba95eaae9d024b830c3365efc2de1a7541120354b0d8f3265be08d' 
  AND token = 'DcwcWuY/Wj9vOPhU9N9CjR1ozSRL0EFu7Y0kqrnQ4aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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