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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b935e3b784ccc5f9d5d1c54c8b52ad6f1fd920015544984a20d4f04f63615883' 
  AND token = 'nxWT8T73/jCvPlcn9FeROEa7olqPdF5bA7nCrFqDXEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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