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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f58920e19b73f18609e87111849c7cefd1d7a7f332e761d94b606b480f8202c' 
  AND token = '84YUDvq3NtCkKa1f750i3ygaM8YIfL701eTxlIFSpi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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