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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f377dcb2ee0602da11a43ae77d0f36ba55b031b3c9ace9c33ef0e81d73c1971' 
  AND token = 'gtYl9fNi1AgZxMfEtN+zTks1toDIq5P8ReQ1NuSYJq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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