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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16f2989b5ddb16482a3ae83096c95b73623e6f7808805ad3d35abe20d2eb08a' 
  AND token = '4YyEHhd6xsbLLBRj7s3iDP3X6NgGCLC9GfpPk9QSrIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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