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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '047f1bb65600216e37894a68455f06914c6e560af1b4342845c9962f5283b4d6' 
  AND token = '7LllQZmMTGAx8nNoDRkR/57yY/i3/nN/SNG6vO2gxg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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