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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9252a02ae10192a5ad87e1ab2484fb8d99448e6ccaab55f210ee90f4fda125e4' 
  AND token = 'MbVAj8crIlrSH2MqkpIPZxEQZN/QCH6VNY0BT3N0GZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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