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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d38c7961012edc8bf777f9c9e6af13c9542935ff99437cb7c5b47ac8cc1e99b' 
  AND token = '4H60GMl1Ee62Qssg7c/ulYLscHcv0VTye6DnSh6USFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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