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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532b9e65f75f91f9ed0a302c6caf7f31bb955d157dc1a3244366097271d2983a' 
  AND token = '3dPb8ZZlqxCgO+U4AV2M7UM594Sq+oKnd5LjyRqajPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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