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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae8a01c831aaa440a943ab63a88216c4eea798c99b36cfcd8e0241f343c47f' 
  AND token = '4lfsDo+JFaM7UXQGza6T+222/Gp9+g/nDFYs38KoSMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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