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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf231e9e28207e6ed01e9b38c3c3430629f058134cc7691c316b03288069451' 
  AND token = '5QJGtDVJAVjmxesE0oJzdJ856WJ4/1s73+zWNMXUBMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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