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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec3e6d3cf6278883325013148458f8fefebe9db9cca4682b3ed9e9b69859f6b' 
  AND token = 'rW+zLSIDl99yFnHi8GOIhSYGuC5LKPa7YrivKxiCb7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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