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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5242ce3af470fd6b6638d449b9f9ec3ed92ca3586b9140b1fd62182feb8f1c' 
  AND token = 'qChs0Utb1vlgeHfLCeGlraMdu05N28Q9JX7/XYxgfbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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