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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fba6678279ebb51786021c3afecde234fb9b35661e72519c2b6670af9cbf77' 
  AND token = 'jrmv5BrHYFmqq+6hYc96YBH/l1gRSdN+uIeOg9if7U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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