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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba6d09c74bba0ac1b64d1ece53ed60f8f19cb63c85dd565c6f550fdde862c28' 
  AND token = 'R9b8wydcoxNJa6oYz3cMAHzyaL9kbsUZSQ8oex5TmzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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