SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32027aabeb710d54df02500448fee8d2de570ab0005ace572341b0b79097e75b' 
  AND token = 'NxjFeMhuV7Z47VB2YcoyP/NCP5T+AEwXMD6pt65f0iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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