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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af268b91c915cb28e004e66fbfec42d63f286008d34a39a389ac4f4e350d10a0' 
  AND token = 'V2ABLRiRyK2wC8iBxkMuAynCkzq0DWyusn02CWV+/7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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