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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5dd997d5e884fcbf1533e581b7aeb74571adb4de8f5b3d7c2a096daa834371' 
  AND token = 'xxY9iqRicofSpL/ps/ruuu07VjSqfobE8Ig4pNjXMBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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