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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855a3db0c19139565ba5ee0a9450c0b95afb5931e1a572050dc5a3f720c064f2' 
  AND token = '0bz5WrdoycVzV/upjC64NL5o64kBXvma1vL7JHwqd7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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