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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bed7d189f2f76200b9d0aadc597ca32531268182f9d0a6a277713e97b1fb10' 
  AND token = '0MBP3XxxKPQoRSvLt35AESRi38yfjJH8S0ODRi0NCJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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