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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc251625732411fbb6d980640533ad093c7f79b19d20823e426150ddd5a8972e' 
  AND token = '4g4hTQDhuKMAnBh+cLHD5BOKgJg8L5gIJwhebb78M/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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