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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b4b0323e0323779b93ceef08898757a7f75b30cc1a9974e0b4aa134bf814a2' 
  AND token = 'IdG01pnDQI6XSdOYlo7WHRj/8VM2nNqw9IhWLEMSeLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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