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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae6ccd3603c0d2915deaa48e67c67ff77ac0adb38306a84a3406d2329dce1bf' 
  AND token = '4VUBZ3o4C7YsGWT1QU7H+nTnSkOB8ug8G/yG1QOs1+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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