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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce426f409d12feb389b531ea321868c7997f2e50c5fbedee44ef85a3daea3d5' 
  AND token = 'Fi9HCqJSsr84arg0U8GegfOVM278G6hmd8/6a0wyW1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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