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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5cfe3d4a3c3aa377b424c9c39f7b8f321a32871d34a830b4523ecef1392971' 
  AND token = 'J+SDpmbxVMo8aGiyBQYW15bep6g2+u5E6CosDeBtgp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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