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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee2c6b7decf750d8aaecf2645632d6ed5b4a4a31ab0832cb9de2c59e826a9b3' 
  AND token = 'ItxkOy9j7+SsYnHIbOCHFVrBurWHPhhpG40nPtdWPDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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