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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f5c5bf9f1c6ac1ee7d06c57e113ad64e2d405ec84398800564ad2570070369' 
  AND token = 'wopmVQ+KqHwzdmrXaI76Uh7QkB9wHIMwb9Hgq17JyQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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