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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c34eeb23a5badffca92c4035a68eed31cb76b4c6043ea7dfeb99382e40ed7f' 
  AND token = 'QTWioVDAmmVdFbVJJ7LyxcvJPr3VCweokdf8FyGfMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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