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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce399065634530a635fd2d4d7bcb8e9bae29991f21906f83b4428ffa8ad15eb' 
  AND token = 'VbmCVhj91RVrU8Wb3SfXKBX7ghiP3w4I1W5FK0Me1TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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