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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ad0b417e961957b86cff2f02f3ee614e907bca362814430d1866a70edc5e85' 
  AND token = '1AOUoU0UOIFnf1+hfW+yjcn5hKDaXVlrAePIvwoIDpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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