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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02961bf28db904c8a578941ab8ac7af8855c0abca88d10eb65d99841c35a6cbc' 
  AND token = '2GXNj+AFhZHNP1DiHZtKP2PLtVjVVgBfoW+NghTEXMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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