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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175a4ce813f13a0592ffa591158ec9a6cd26c7fab071fcae27e2896ebe6840cc' 
  AND token = 'q9KULVIMFx/ulps7zvdPCFbtuk3VFJfaXDbaTCq2TVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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