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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02de877a7209de3ff71a1865d6a18525646218b34293a18e626481d88ed85fd6' 
  AND token = 'Wz5JsWwzE+2neprYufHzEQTyK7L8XSVNWt1k2zMk0X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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