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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd3b4b24a486226e5b2e3f0c2e09bc03baa8041f0b40ab26a10852f87e36ea6' 
  AND token = 'Arm3hn+02mQoSOX2odjyWQXHEpfT9MSaXmp1uSsAgX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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