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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073cc3c49691a64baeb8d618379141a6a17196a8a12b922641a72627ef498bad' 
  AND token = 'd/ticzy27vF4EkDlPygg7JYkZDFzataHWykzjMQcntI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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