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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7905fc5f41e1eaa1399d5afda85bdccd7cc7907f6bc39270c7985472db4d8be3' 
  AND token = 'YYMn11xuj9XMltdnU0CIT8lwfek4dugMDhBQHvAjGBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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