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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2839bd01bd582e54794ff9090de196c37ce2a7e511aaa735d6cd0cead8c8fb' 
  AND token = 'VvHCJzoWbk/Tk7R8yrcnNQV21FtCnODG1/rketD9IfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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