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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da31e10ef342a249aa9f26b91499246a721030cabfa88a5789532a7c67ec1bdd' 
  AND token = '//b+FW+Q3Puswd/abRmDnxP7OW+qoZqpVxow4uQ/P2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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