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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfdea7e07317bc1992052121346429cab10e00dfcd1e90184e3b1cfe80317c6' 
  AND token = 'u5tgEpcyI/ydgtR2l/LfLAvE8T9wRv5kJ4q95bQ4v8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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