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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e860c61c1dffbdada1bf6f332892d99edd034e41b0042c9fc5e2ae69828da24' 
  AND token = 'Ik0vnsbKbtttbQGDr7SRgG5D/K1W1W4Ko8PMbrrQ6Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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