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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efef56e1b9f8014cff1f62e03c595fade2b83236be249d85174e82ef6bcf2b7' 
  AND token = 'mk2TgJ5Nk2+YkxPxqdnWU0d1w/OdGdV51XuKE3zeCg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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