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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32820efcfc28eade067a9d9b4e92880c112964b5b802d22ff7f1ce7f4bfbac70' 
  AND token = 'wGMrGnCcb6VqE+V0KPBhRbWVdYonNKK/WqhYZFrSoTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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