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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039e1a673dfd7280e5ea53b0b78e311c085f7d34aa7f1f53decedc747caf3c5a' 
  AND token = 'kT7qnpIV1xbsE60f3hktAaTpExC44qCK8ZNQlVX2fMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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