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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f2f435109d16f57a81f27c6171304acf78bf16ccdc34bf4ed6e13c638b8a68' 
  AND token = 'mWM832Z7u2AB0NnhUkziDx9bh96whl50NV43V6L4LIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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