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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249fa1ab54c0d5e3458891be17c8003ab30d0f56102a332c65667ea0dfa9ca2d' 
  AND token = 'B/1SCiD+mj7EX0owSFvxIcIHYgxnkHZNRUMPAjs1rZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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