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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b0abd9587f5b1665a85d7aba85d5dee98bc2eb2f2a537ad1ae07eb5b01a606' 
  AND token = 'XX+cuC/lJBwb35/bVgEoGueXDh+V6DpinaVU+iVg56Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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